A121279 - OEIS

A121279 as a simple table

n	a(n)
0	1
1	2
2	2
3	2
4	2
5	3
6	3
7	3
8	4
9	4
10	5
11	5
12	6
13	7
14	8
15	9
16	11
17	12
18	14
19	16
20	19
21	21
22	25
23	28
24	33
25	38
26	44
27	50
28	58
29	67
30	77
31	89
32	103
33	119
34	138
35	159
36	184
37	212
38	245
39	283
40	327
41	378
42	437
43	505
44	583
45	674
46	779
47	900
48	1041
49	1203
50	1390
51	1606
52	1856
53	2145
54	2479
55	2865
56	3311
57	3827
58	4422
59	5111
60	5907

[1,2,2,2,2,3,3,3,4,4,5,5,6,7,8,9,11,12,14,16,19, 21,25,28,33,38,44,50,58,67,77,89,103,119,138,159, 184,212,245,283,327,378,437,505,583,674,779,900, 1041,1203,1390,1606,1856,2145,2479,2865,3311,3827, 4422,5111,5907]